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Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter

Author

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  • Kui-Jun Lee

    (Department of Electrical Engineering, Korea National University of Transportation, Chungju 27469, Korea)

Abstract

Since a T-type three-level PWM converter has several intrinsic advantages, it has been researched for various applications such as grid-connected converter systems. However, it necessarily requires an additional voltage control loop for balancing the upper and the lower DC-link voltage. To satisfy this requirement, an offset voltage is widely used to provide a neutral point current without affecting other variables such as total DC-link voltage and three-phase input current. However, these methods are mostly based on the averaged value between the applied offset voltage and the neutral point voltage or current, and there is no exact analytical model. Therefore, in this paper, the exact theoretical relationship between the offset voltage and the neutral point current is analyzed. This result can be expected to be useful for an effective voltage balancing control loop design as well as the better understanding of the whole system operation. The validity of the obtained analytical model is verified by simulation and experimental results.

Suggested Citation

  • Kui-Jun Lee, 2020. "Analytical Modeling of Neutral Point Current in T-type Three-level PWM Converter," Energies, MDPI, vol. 13(6), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1324-:d:331752
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    References listed on IDEAS

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    1. P. Madasamy & V. Suresh Kumar & P. Sanjeevikumar & Jens Bo Holm-Nielsen & Eklas Hosain & C. Bharatiraja, 2019. "A Three-Phase Transformerless T-Type- NPC-MLI for Grid Connected PV Systems with Common-Mode Leakage Current Mitigation," Energies, MDPI, vol. 12(12), pages 1-25, June.
    2. Cristian Verdugo & Samir Kouro & Christian A. Rojas & Marcelo A. Perez & Thierry Meynard & Mariusz Malinowski, 2019. "Five-Level T-type Cascade Converter for Rooftop Grid-Connected Photovoltaic Systems," Energies, MDPI, vol. 12(9), pages 1-20, May.
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    Cited by:

    1. Kui-Jun Lee, 2021. "Analysis of Allowable Unbalanced Load Conditions for T-Type Three-Level PWM Converter," Energies, MDPI, vol. 14(18), pages 1-11, September.

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